Lenovo tablet won't power on? - 1

So this morning my alarm didn't come on, I'm not sure if I didn't set it or it just didn't come one and when I went to turn it on it came on fine (I just looked at the time) but I got back from taking my sister to school and when I turned it on I typed it my passcode, when I clicked enter or whatever it is it froze so I pressed the power button and not it won't turn on… Please help!